Note 12 - Fair Value Measurements (Detail) - Unobservable Inputs for Level 3 Fair Value Measurements (USD $)	6 Months Ended
	Mar. 31, 2013
Oil Collars [Member] | Minimum [Member]
Price volatility curve, percentage	0.00%
Oil Collars [Member] | Maximum [Member]
Price volatility curve, percentage	16.47%
Oil Collars [Member]
Weighted average of price volatility curve, percentage	10.25%
Fair Value (in Dollars)	(44,299)
Natural Gas Collars [Member] | Minimum [Member]
Price volatility curve, percentage	0.00%
Natural Gas Collars [Member] | Maximum [Member]
Price volatility curve, percentage	26.19%
Natural Gas Collars [Member]
Weighted average of price volatility curve, percentage	17.70%
Fair Value (in Dollars)	(318,529)